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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
diastole - the widening of the chambers of the heart between two contractions when the chambers fill with blood. heartbeat, beat, pulse, pulsation - the rhythmic contraction and expansion of the arteries with each beat of the heart; he could feel the beat of her heart. Translations.